Multiple tables in UPDATE or DELETE action of trigger <str>

  Explanation:  The delete or update actions are performed in  the
  context  of join (CROSS) of multiple database tables.  This type
  of trigger action cannot be extracted in SQL and  is  no  longer
  recommended in RDO.

  User Action:  Recode the join as a single  table  reference  and
  subqueries as described in the Oracle Rdb documentation.